MT4 · Compilation errors
MT4 129 · Structure member with the same name already defined | YI GOLD
Official meaning
Structure member with the same name already defined
Possible causes · YI GOLD suggestions
Determine the cause from the official meaning, the triggering function and terminal logs.
Troubleshooting · YI GOLD suggestions
Locate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile.